AirAsia sells very few connections, the connections they sell are mostly short haul to long haul, like BKK to KUL to HNL/SYD. Last summer I was thinking about flying to India from Kunming, and the only way to do it on AirAsia was to either buy two seperate tickets or buy them from Kiwi.

Kiwi sells two seperate tickets with two seperate PNRs, but Kiwi guarantees the connection and Kiwi will book you a new flight if you miss your connection (although I have read that their customer service is not the greatest). I really like KL, so I usually just book two seperate tickets with a day or two in KL in between flights, rather than roll the dice on a same day connection. My friend tried to book a same day self connection on AirAsia, and AirAsia changed his first flight time, putting him on a new flight that left 12 hours later, changing his 13 hour self connection to a bit over one. He ended up demanding a refund from AirAsia for his first flight and reconfigured his travel plans.